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Title

DESIGN PROCESS OF SELECTING APPROPRIATE DROUGHT INDEX BASED ON MONITORING MULTIVARIATE METEORS IN SOME STATIONS OF ARID AND SEMI-ARID REGIONS, IRAN

Pages

 Start Page 414 | End Page 426

Abstract

 In drought monitoring, different indices usage may leads to different results. In this study, Meteorological variable statistics from 5 synoptic stations of Mashhad, Tehran, Tabriz, Kermanshah and Shiraz among 50 years periods, 1957-58 to 2006-07 were used. In order to evaluate meteorological DROUGHT INDICES, 8 indices such as: RAI, SIAP, DI, PN, *SPI, CZI, SZI and *RDI (Select) were examined. In this study, in order to Promote them, by utilizing 50 metrological variable related to precipitation, evapotranspiration and number of rainy days, a new multivarate method for detect dry and wet years was established based on Chang threshold and SCALOGRAM model. Then based on mentioned years as criteria of important dry and wet years and applying a new statistical criteria as “Total Accuracy (TA)”, APPROPRIATE INDEX was selected. In 3 synoptic stations of Mashhad, Tehran and Shiraz, TA value for *RDI (Select), was equal to 0.46, 0.51 and 0.51 respectively. In Tabriz station TA value of 3 indices, *SPI, CZI, SZI was equal to 0.88 and in Kermanshah station TA value of CZI index was equal to 0.64. These indices used as proper index for each station.

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